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27 Sep 2017 8:19:02am

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LFRTs are not sub-critical reactors. The fuel for such reactors is the uranium-233 bred from thorium (thorium by itself is not fuel), and fission takes place in a region of the core where the liquid fuel is configured in a fissionable geometry. So-called 'sub-critical' thorium reactors are something else, requiring input from a particle beam to reach criticality.

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